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Select your affordable WD7 extension builder
Her, WD7
Need to find an Extension Builder near you for all your extension buildering work?
ARI Studio LTD provides a local, trusted extension build...
From £2,104
Astrit Gjabri
Very good builder Brick work block work ground fencin drive ways patios extension New building no job to small
From £2,264
Radlett, WD7
Griggs Homes is an established extension buildering business in WD7. We come highly recommended and provide competitive quotes for your work.
From £2,344
Relax... you have found a reliable extension builder in WD7. ADS Builders is a friendly and reliable company based in WD7 who consider no job as to...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in WD7 it ranges from £2,104 (LF Gjabri Contractions Ltd based in WD6) to £2,344 (ADS Builders based in WD7).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in WD7 by posting a job with HaMuch and we will send it to extension builders in WD7.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,538

Two storey extension - £88,057

Build a timber frame extension - £26,038

Build a swimming pool - £81,038

Single storey extension - £55,760

Side return extension - £41,928

Install an RSJ - £2,238

Outbuilding - £10,038

Build a Mansard loft conversion - £52,038

Loft conversion - £34,106

Build a kitchen extension - £42,038

Hip to gable loft conversion - £42,038

Granny annexe - £87,038

Garden office - £10,038

Convert a Garage - £16,038

Garage - £18,538

Build a flat roof extension - £22,038

Build a dormer loft conversion - £42,038

Concrete foundations - £6,288

Convert a bungalow loft - £29,038

Convert a basement - £37,928